Magnetic traction-wheel drive.



V @.sGoTT. EAGHETIO TEGTIOH WHEEL DRIVE.

LPPLIOATIOH FILED DEO. 16,1906. Patented Feb.8,1910.

2 SHEETS-SHEET 1.

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ATTORNEY c. SCOTT. HAGHETIC TRACTIOH WHEEL DRIVE.

PPLIOATIOH FILED DEO. 18,1905. 948,38 1. Patented Feb. 8,1910.

3 SHEETS-SHEET 2.

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CAIMPIBELL SCOTT, OF YONKERS, NEXV YORK, ASSIGNGB. 'IO OTIS ELBVATOR COMPANY, OP JERSEY CITY, NEW JERSEY, fr CORPORATION OF NE'W JERSEY.

MAGNETIC 'PRACTICE-WHEEL DRIVE.

948,381, Specification of Letters Patent. Patented Fel), S, lglf), Application filed December 16, 1905. Serial No. 291,9?8.

To all liff/ioni lZi'. may concern: j wear 0n the rope due to bending iS greatly 55 lle it known that I, Cimrnu. Scorr, a lessened. citizen of the United States, residin r in the M designates an electric motor which may cit \Y of Yonkers. in the county of ll'cstchcsbe of any desired type. but l do not. wish to ter and Slate of New York. have invented a be restricted to au electric motor as means new and useful Improvement in Magnetic entirely mechanical could be used as well for 60 Traction-lli'heel Dri ves, of which the tollowtransmittingr power to thc drive wheel T, in ing is a specification. y which case. the winding: of the latter could My invention relates to traction drive elel be excited independent orn an)A motor circuits.

vators, and one of its objects is the provision S designatesI a manual switch in the car of simple and efiicieut means for varying C which when moved in one direction or the 65 the magnetic attraction between the drive other will operate either of the reversing wheel and the hoisting rope or ropes. i .switches lt or R' and either auxiliary switch c More particularlyv it is the object of the X or X to effect the desired operation of present. invention to provide means for del the ear. For instance, if the lever S2 is ereasinj r the strength of a magnetic friction moved to the right it will first engage the 70 drive wheel after the elevator has been startfixed contact strip 1G and thereafter the concd and again increasing the strength ot the l tact strip 83 or both of said strips may be same upon stoppinl engaged at the same time. A circuit is thus Otherobjects of theinvention will appear closed from the positive main to and hereiliafter, the novel combinations off clel through the main line switch L, wires 18, 75 ments being pointed out in the claims. 1), Sti, solenoid 20', wire Q1. contact Strip In the accompanying drawing, Figure 1 Sil, lever Si, wires 22, 23 and 2l to the negarepresents more or less diagrammatieally an tive main. rIhe switches ll and X Will elevator system with my invention applied l thereupon be closed and the motor circuits thereto; Fig. Q represents a side view, partly e completed. The circuit through the arma- 80 in section, of the magnetic traction wheel; ture extends through the wires 1S and 19, and Fig. 3 is a plan view, partly in section, contacts 25, Q6, wires 2T. 2S, Q9, brush 30, of the wheel shown in Fig. Q. i armature 32. brush 31, wire 323, starting re- In Fig. l, C designates an elevator car i sistance S, wire 3l, contacts 35, 3G. wires 3T,

connected by means of ropes 2 of magnetic l 2?. 2st to the negative main; while the cir- 85 material to the couuterweight il'. These cuit through the shunt field is completed ropes pass upwardly from the car to and from the positive main through the wire 18, over the overhead sheaves 3 and 5, and l Contact T5S, contact plate 39, contact 40, wire thence downwardl)Y under the traction wheel f 41, motor terminal 4:2, shunt field coil (not T. The ropes pass upwardly from the wheel shown), terminal 43. wires 86, :7.4 t0 the 90 T to and over the sheaves to the counternegative main. It will thus be seen that the -weight ll'. ln this instance, l have shown switch R closes the armature circuit while the sheaves 3 and 5 mounted on the over` i the auxiliary switch X closes the field cir- 40 head beam 4 and the. sheave 5' on the beam f cuit. The car switch also closes a shunt cir- 4. The particular arrangement of the cuit through wires Si and 50, terminal 5l, 95 .h i sheaves and their number may be varied as f winding G3 of the wheel T, terminal wire desired, but b v `the use of a magnetic traej 5l, contacts SS. 90 and bridge piece 5S. wire tion wheel a smaller' number is required and f 91, contact strip 1li, lever S2, wires 22, 23,

there will be less wear on the ropes due to 24 to the negative main. Both the shunt 5 bending. If desired, the beams el, 4f may field coil andthe traction wheel winding are 100 g be in the same plane or the sheaves 5, 5 thus connected directly across the mains and may be mounted on opposite sides of the maximum current flows through the latter. beam 4. In most instances, at least three The traction wheel T may be made in varidirection sheaves must be used as shown but ous ways, that herein shown being that disby reason of the magnetic feature of the closed and claimed in an application filed by drive wheel T no additional sheaves near l David L. Lindquist, Serial No. 991,979, co-

this wheel are required to secure necessary pending herewith This particular traction friction, and this is a great advantage as the f wheel is shown here merely by way of illustration. That disclosed in another co-pending application by August Sundh, filed December 1G, 1905, Serial No. 291,986, could also be used if desired.

The main object of my invention is to les` sen the consumption of current necessary for energizing the traction wheel. I therefore provide means for strongly magnetizing said wheel when the motor is started and also when it is slowed down to a stop. In this instance, I associate a resistance with the accelerating apparatus so the former may be automatically inserted in circuit with the winding (33 after the motor has attained a predetermined speed.` Upon slowing down the motor prior to stopping, this resistance is automatically cut out to again increase the magnetic strengtlrof the wheel.

Referring to Figs. 2 and 3, it will be seen that. the drive wheel T is made up of two sections or halves suitably secured together as by means of bolts and nuts after the winding 63 has been put in place in circular recesses near the periphery of the wheel.

60 designates the hub and 61, 6l the web portion of the wheel.

(3G, GG designate the rim flanges for preventing the ropes from running olf, while 67 are grooves for the ropes to prevent them from running over each other.

Each section is provided with a plurality of lateral projections tS-, Se with predetermined spaces between them to allow the halves to be put together dove-tail fashion but leaving zig-zag air gaps between the projections of one half and those of the other. lVhen the winding G3 is excited with electric current, the sectionsl are oppositely polarized, as the wheel is in reality an electromagnet and the projections are in elfect alternate north and south poles. If desired, the air gaps may he filled with. some nonmagnetic material, as, for example, wood, brass or Babbitt metal, etc., so as to malte a solid wheel. Furthermore, the grooves (5T may be cast with the sections or they may be turned after the wheel has been assembled.

Secured to one end of the hub G0 I have shown a ring 5o of insulation on which are mounted two slip rings 73 and 8l connected to the terminals of the winding G3. Suitable insulated and springpressed brush holders 72 and 5l are supported by the bracket 69 which extends upwardly from the bearing 7l at the upper end of the standard 70. These brushes are adapted to slide an the slip rings 'T3 and 81 to convey current through wires 87 and 50 to the wlnding (33 and thence out through the wire 5st and other connections to the negative main.

The accelerating magnets A are connected series with each other in a circuit between the points 55 and 92, which is directly across the armature. A fixed bar 57 may be provided with screws 56 to form adjustable stops to limit the downward movement of i the cores of the accelerating magnets. This arrangement etlects a successive lifting of said cores so that the sectional resistance 8 shall be gradually cut out by the switches operated by the accelerating magnets. The switches in this instance comprise bridge pieces 58 rigidly connected to the cores to more therewith, and also fixed contacts 59 connected atvarious points to the resistance S. Any other means than that shown for successively operating the switches may be employed if desired. v

'hen the last bridge piece 5S of the series is lifted the resistance is inserted in the circuit containing the winding (S3 of the traction wheel T, said resistance being connected between the contacts 8S and 90. This resistance may be so designed as to obtain any desired reduction of current in the winding G3.

lt is evident that by reason of the inertia of the various moving parts more power is required in starting and stopping than when the car is under way. In order to Secure sufficient friction and adhesion of the ropes to the friction drive the magnetism should be great enough to prevent slipping at any time during the operation of the elevator' apparatus. And to economize current and thus malte the system more ellicicnt l reduce the magnetism of the traction wheel after being started to full speed but increase it again in slowing down before stopping. For the sake of simplicity, I have omitted in the drawings any brake apparatus in connection with the car, sheaves or motor shaft. These could also be supplied as desired but the system, if properly designed, may depend entirely on the increased magnetism of the traction drive wheel in bringing the moving parts to a sto In order to stop the elevator car gradual y there may be a plurality of resistances such as that indicated 85, which may be inserted one after another and also successively cut out b v any approved means. For example, an additional set of contacts similar to those designated SS and could be. arranged under the bridge piece to the left of that designated 5S at the extreme right and an additional resistance S5 connected to these contacts. In such case when the switch in the car is brought to its intermediate or slow-down position, the motor circuits would be interrupted but the lever S2 would still be on the strip 16 or 1T. The accelerating magnets would be denergized and their cores would drop back to original position and those at the right would effect the cutting out of the resistance S5. The magnets at the right may have the downward movement of their cores retarded in varying amounts so that the resistances- S5 would be cut out step-by-step.

Without limiting myself to the precise con- Cil struction 'of details or arrangement of parts, what I claim and desire to have protected by Letters Patent. of the United States is:

1. ln an elevator, the combination with a car and hoistin; r cable. of a magnetic .-heave, a motor for driving said sheave, and means controlled by a single device for snpplying' electric current to said motor and said sheave through ditierent circuits and from a common source of supply.

:2. In an elevator. the combination with an elevator car, connterweight and hoisting cables, of a magnetic sheave associated with said cables, a single device in the car, and means controlled by said single device for eli'ectintr the supply ot' current to said motor and sheave from a source ot cnrrent supply independent of the motor.

3. ln an elevator, the combination of an electro-magnetic sheavc. and means for antomatically insertingr resistance in circuit with the windings of said sheave.

l. ln an elevator. the combination with a car and its motor. ot' a magnetic sheave connected to be driven by said motor, one or more hoisting' cables connecting the car to said sheave, and means controlled from the car for supplying current to themotar and sheave. throngh ditierent circuits supplying current independently of the moor and thereby etecting,r the energization of the sheave and the operation of the motor.

5. In an elevator. the combination with a magnetic sheave, of driving means therefor, and means controlled b v a single device for supplyingr current to the sheave and driving means through separate circuits. and thereby etl'ectin,"r the application of power to said sheave and driving means. the current to said sheave being supplied from a source independent ofsaid driving means.

G. In an elevator, the combination with a magnetic traction sheave, of a motor for driving the same, and means for 'nttomatically deer asing the magnetism of the sheave after the motor has started, and again increasing it before stopping.

T. rthe combination with an electro-magnetic traction sheave, of a motor for driving the same, and means for controlling,r the application of current tothe winding of said sheave to elect different values of magnetism in said sheave varyingY in accordance with the tractive power required at starting, stoppingr and intermediately.

ln an elevator, the combination with a car and its motor, of a counter-weight for the car. one or more hoisting cables connectintr the car and connterweight, a magnetic traction sheave connected between said motor and said cables, and automatic meansfor varying the magnetism of the entire sheavc in accordance with variations in the tractive power required by said sheave.

9. In an elevator, the combination with a car, of a motor, a magnetic shtave connected to said motor, one or more cables ofty magnetic material connecting the sheave and car, and means for reducingr the current consinned by said sheave after the car has attained a predetermined speed.

10. ln an elevator. the combination with a motor, of a magnetic traction drive wheel driven thereby, a car and counterweight, one or more cables connecting the car and conntervveigilit and passing around said drive wheel, and automatic means l'or simultaneously varying?r the magnetism of all parts of the wheel to correspond with variations in the tracive power required by said wheel.

ll. ln an elevator, the combination with a car, of a motor, a majrnetic sheave connected to be driven by the motor, one or more ropes or cables connecting' the sheave and car, means for energizing said sheave npon starting; the motor, and means coaetinj,v with said energizingr means for decreasing the energization of said sheave at'ter the car has attained a predetermined speed.

l2. ln an elevator, the combination with a car, counterweight and connecting' cables, of a motor, a magnetic sheave connected to be driven by said motor and associated with said cables to transmit motive power to the same to hoist or lower the car, means for ei1er fizin r said sheave upon starting,r thc motor. and means t'or partially denergizing said sheave after the motor has attained a predetermined speed.

13. In an elevator, the combination with a car, connterweight and connecting cables, of a motor, a magnetic sheave driven by said motor and associated with said cables to drive the same, motor-controlling means, and automatic means associated with said motor-controlling means for simultaneously variably emfngfizintr the entire sheave to correspond with the duty required of said wheel.

14. In a traction elevator, the combination with a car, counterweight and connecting cables, of a motor and a magnetic sheave for drivingr said cables to hoist or lower thc car, and motor-controlling means for partially denergizing said sheave to lessen the consumption of cnrrent while the motor runs at substantially full speed. i

15. In a traction elevator, the combination with a car, of a motor, a magnetic sheave connected to said motor, cables of magnetic material connectingr said car and sheave, motor-controlling means, and means controlled from the car for eteeting the energization of said sheave before the operation of said motor-controlling means.

16. In a traction elevator, the combination with a car, counterweight and connecting cables, of a motor, motor-controlling means, a magnetic sheave connected to be driven by said motor, means controlled from the car for effecting the energization of said sheave, and means co-acting with said motor-controlling means for automatically reducing the current flow to said sheave after the inotor has attained a predetermined speed.

17. In a traction elevator, the combination with a car, eounterweight and connecting cables, of a motor, a sheave connected to be driven by said motor, means for strongly magnctizing said slieare upon Starting and partially de-magnetizing same after the motor has attained a predetermined speed, and means (2o-acting with the aforesaid means for again strongly imizgfuetizinzcT said slieave at or before slowing down said car to stop tlie same.

1S. In a traction elevator, the combination with a car, couuterweiglit and connectingY cables, of a motor and sheave associated with said cables, an electromagnetic winding' or windings for said slieave, means` for controllingr the current ow to said winding to energize the slieave, and means for reducing the current fiow to said winding after the motor has attained a predetermined speed.

19. In a traction elevator, the combination with a car, connterwcifflit and connecting cables, of a motor, an electromagnetic sheaves connected to be driven by' said motor and associated with said cables to transmit motive power to the same, means controlled from the car for strongly energizing said shear@ upon starting and stopping the motor, a resistance, and automatic means for tion element, and means (2o-acting with said motor-controlling means for automatically inserting said opposition elementy in circuit with the electromagnetic slieare upon the motor attaining a predetermined speed and automatically cutting out said opposition element upon slowing down the motor to stop the car. ln testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses.

CAMPBELL SCOTT. lVitnesses CHARLES M. NIssEN 2 AUGUST SUNDH. 

